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Paints and printing inks containing modified carbon blacks

a technology of carbon black and printing ink, which is applied in the direction of pigment paste, inks, coatings, etc., can solve the problems of unfavorable increase in viscosity of products and disadvantages of a large quantity of solvents

Inactive Publication Date: 2002-04-30
DEGUSSA AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding silica may, however, result in an undesirable increase in the viscosity of the product.
But the greater quantity of solvents is of disadvantage since the pigment loading is reduced and also from environmental considerations.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Four different carbon blacks were produced using the furnace black process. Differing quantities of silicone oil (polydimethylsiloxane, CAS no. 63148-62-9) were added to the carbon black feedstock. The technical properties of these carbon blacks are reproduced in table 2.

The ash content of the above carbon blacks substantially consists of highly disperse silicon dioxide. Carbon black 1 is a comparison black having an ash content of only 0.1 wt. %, which was produced without adding silicone oil to the carbon black feedstock. Carbon black 2, carbon black 3 and carbon black 4 contain approx. 12, 14 and 16 wt. % of silicon dioxide.

Application testing:

The four carbon blacks from table 2 were used to produce black paints in a two-component binder system based on hydroxylated acrylate resins with isocyanates as the curing agent.

The paints were produced using a binder solution comprising 60 wt. % Synthalan LS768 from Synthopol Chemie, Buxtehude, in 98% butyl acetate. The binder is a hydroxy...

example 2

A further series of six furnace blacks were produced with different silicon contents. The carbon black test results are shown in table 4. The starting carbon black (carbon black 5) was produced without the addition of silicon oil to the carbon black feedstock oil. Its ash content of 1.22 wt. %, therefore, results mainly from calcium carbonate added to the feedstock oil to influence the structure of the final carbon black. The surplus ash content of the carbon blacks 6 to 10 is due to their silicon dioxide content.

Paint testing:

The six carbon blacks from table 4 were used to produce black paints in an aqueous binder system (polyurethane dispersion; 30 wt. % polyurethane, relative to the weight of the dispersion) and in a two-component binder system (Synthalan LS768 in 98% butyl acetate). The paints were produced in a similar manner as in Example 1. The results of the paint testing and the rheological behavior of the paints are shown in tables 5 (aqueous binder system) and 6 (two-comp...

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Abstract

Paints and printing inks are disclosed which contain carbon black as the pigment. The dispersion and storage stability of printing inks and paints may be improved by using carbon blacks containing silicon. The rheological behavior of the paints is improved by silicon-doping of the carbon blacks used. Paints having a reduced solvent content are consequently obtainable.

Description

INTRODUCTION AND BACKGROUNDThis present invention relates to paints and printing inks which contain carbon black as the pigment.The black pigment used in paints and printing inks is predominantly carbon black due to its excellent properties. Apart from use for the production of pure black colors, carbon black is also used for tinting with other pigments, in particular for the production of grey hues by blending carbon black with white pigments such as titanium dioxide and other white pigments.Pigment blacks are available in a large selection of grades having differing properties. Various processes are used for producing pigment blacks. The most common process is production by oxidative pyrolysis of carbon black feedstocks containing carbon. In this process, the carbon black feedstocks are incompletely combusted at elevated temperatures in the presence of oxygen. This class of carbon black production processes includes, for example, the furnace black process, the gas black process an...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C09D11/02C09D11/00C09D7/12C09D17/00C09D7/43C09D11/037C09D11/324
CPCC09D11/324C09D7/1225C09D11/037C08K3/04C08K9/02C08K9/04C09D7/43C09D7/40C09D5/00
Inventor OTTO, KARINSTROH, PETER
Owner DEGUSSA AG